Re: [PATCH 15/32] IGET: Stop EXT4 from using iget() and read_inode() [try #2]

From: Jan Kara
Date: Tue Oct 09 2007 - 11:45:36 EST

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> Stop the EXT4 filesystem from using iget() and read_inode(). Replace
> ext4_read_inode() with ext4_iget(), and call that instead of iget().
> ext4_iget() then uses iget_locked() directly and returns a proper error code
> instead of an inode in the event of an error.
>
> ext4_fill_super() returns any error incurred when getting the root inode
> instead of EINVAL.
>
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Acked-by: Jan Kara <jack@xxxxxxx>

> ---
>
> fs/ext4/ialloc.c | 58 ++++++++++++++++++++++++++++-------------------
> fs/ext4/inode.c | 25 +++++++++++++++-----
> fs/ext4/namei.c | 29 +++++++-----------------
> fs/ext4/resize.c | 7 ++----
> fs/ext4/super.c | 36 ++++++++++++++++-------------
> include/linux/ext4_fs.h | 2 +-
> 6 files changed, 87 insertions(+), 70 deletions(-)
>
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 427f830..4fba007 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -659,14 +659,15 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
> unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
> unsigned long block_group;
> int bit;
> - struct buffer_head *bitmap_bh = NULL;
> + struct buffer_head *bitmap_bh;
> struct inode *inode = NULL;
> + long err = -EIO;
>
> /* Error cases - e2fsck has already cleaned up for us */
> if (ino > max_ino) {
> ext4_warning(sb, __FUNCTION__,
> "bad orphan ino %lu! e2fsck was run?", ino);
> - goto out;
> + goto error;
> }
>
> block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
> @@ -675,38 +676,49 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
> if (!bitmap_bh) {
> ext4_warning(sb, __FUNCTION__,
> "inode bitmap error for orphan %lu", ino);
> - goto out;
> + goto error;
> }
>
> /* Having the inode bit set should be a 100% indicator that this
> * is a valid orphan (no e2fsck run on fs). Orphans also include
> * inodes that were being truncated, so we can't check i_nlink==0.
> */
> - if (!ext4_test_bit(bit, bitmap_bh->b_data) ||
> - !(inode = iget(sb, ino)) || is_bad_inode(inode) ||
> - NEXT_ORPHAN(inode) > max_ino) {
> - ext4_warning(sb, __FUNCTION__,
> - "bad orphan inode %lu! e2fsck was run?", ino);
> - printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
> - bit, (unsigned long long)bitmap_bh->b_blocknr,
> - ext4_test_bit(bit, bitmap_bh->b_data));
> - printk(KERN_NOTICE "inode=%p\n", inode);
> - if (inode) {
> - printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
> - is_bad_inode(inode));
> - printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
> - NEXT_ORPHAN(inode));
> - printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
> - }
> + if (!ext4_test_bit(bit, bitmap_bh->b_data))
> + goto bad_orphan;
> +
> + inode = ext4_iget(sb, ino);
> + if (IS_ERR(inode))
> + goto iget_failed;
> +
> + if (NEXT_ORPHAN(inode) > max_ino)
> + goto bad_orphan;
> + brelse(bitmap_bh);
> + return inode;
> +
> +iget_failed:
> + err = PTR_ERR(inode);
> + inode = NULL;
> +bad_orphan:
> + ext4_warning(sb, __FUNCTION__,
> + "bad orphan inode %lu! e2fsck was run?", ino);
> + printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
> + bit, (unsigned long long)bitmap_bh->b_blocknr,
> + ext4_test_bit(bit, bitmap_bh->b_data));
> + printk(KERN_NOTICE "inode=%p\n", inode);
> + if (inode) {
> + printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
> + is_bad_inode(inode));
> + printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
> + NEXT_ORPHAN(inode));
> + printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
> /* Avoid freeing blocks if we got a bad deleted inode */
> - if (inode && inode->i_nlink == 0)
> + if (inode->i_nlink == 0)
> inode->i_blocks = 0;
> iput(inode);
> - inode = NULL;
> }
> -out:
> brelse(bitmap_bh);
> - return inode;
> +error:
> + return ERR_PTR(err);
> }
>
> unsigned long ext4_count_free_inodes (struct super_block * sb)
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index a4848e0..c4fb1eb 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2595,21 +2595,31 @@ void ext4_get_inode_flags(struct ext4_inode_info *ei)
> ei->i_flags |= EXT4_DIRSYNC_FL;
> }
>
> -void ext4_read_inode(struct inode * inode)
> +struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> {
> struct ext4_iloc iloc;
> struct ext4_inode *raw_inode;
> - struct ext4_inode_info *ei = EXT4_I(inode);
> + struct ext4_inode_info *ei;
> struct buffer_head *bh;
> + struct inode *inode;
> + long ret;
> int block;
>
> + inode = iget_locked(sb, ino);
> + if (!inode)
> + return ERR_PTR(-ENOMEM);
> + if (!(inode->i_state & I_NEW))
> + return inode;
> +
> + ei = EXT4_I(inode);
> #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
> ei->i_acl = EXT4_ACL_NOT_CACHED;
> ei->i_default_acl = EXT4_ACL_NOT_CACHED;
> #endif
> ei->i_block_alloc_info = NULL;
>
> - if (__ext4_get_inode_loc(inode, &iloc, 0))
> + ret = __ext4_get_inode_loc(inode, &iloc, 0);
> + if (ret < 0)
> goto bad_inode;
> bh = iloc.bh;
> raw_inode = ext4_raw_inode(&iloc);
> @@ -2636,6 +2646,7 @@ void ext4_read_inode(struct inode * inode)
> !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) {
> /* this inode is deleted */
> brelse (bh);
> + ret = -ESTALE;
> goto bad_inode;
> }
> /* The only unlinked inodes we let through here have
> @@ -2683,6 +2694,7 @@ void ext4_read_inode(struct inode * inode)
> if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize >
> EXT4_INODE_SIZE(inode->i_sb)) {
> brelse (bh);
> + ret = -EIO;
> goto bad_inode;
> }
> if (ei->i_extra_isize == 0) {
> @@ -2729,11 +2741,12 @@ void ext4_read_inode(struct inode * inode)
> }
> brelse (iloc.bh);
> ext4_set_inode_flags(inode);
> - return;
> + unlock_new_inode(inode);
> + return inode;
>
> bad_inode:
> - make_bad_inode(inode);
> - return;
> + iget_failed(inode);
> + return ERR_PTR(ret);
> }
>
> /*
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 5fdb862..301f41f 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1044,17 +1044,11 @@ static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, str
> if (!ext4_valid_inum(dir->i_sb, ino)) {
> ext4_error(dir->i_sb, "ext4_lookup",
> "bad inode number: %lu", ino);
> - inode = NULL;
> - } else
> - inode = iget(dir->i_sb, ino);
> -
> - if (!inode)
> - return ERR_PTR(-EACCES);
> -
> - if (is_bad_inode(inode)) {
> - iput(inode);
> - return ERR_PTR(-ENOENT);
> + return ERR_PTR(-EIO);
> }
> + inode = ext4_iget(dir->i_sb, ino);
> + if (IS_ERR(inode))
> + return ERR_CAST(inode);
> }
> return d_splice_alias(inode, dentry);
> }
> @@ -1083,18 +1077,13 @@ struct dentry *ext4_get_parent(struct dentry *child)
> if (!ext4_valid_inum(child->d_inode->i_sb, ino)) {
> ext4_error(child->d_inode->i_sb, "ext4_get_parent",
> "bad inode number: %lu", ino);
> - inode = NULL;
> - } else
> - inode = iget(child->d_inode->i_sb, ino);
> -
> - if (!inode)
> - return ERR_PTR(-EACCES);
> -
> - if (is_bad_inode(inode)) {
> - iput(inode);
> - return ERR_PTR(-ENOENT);
> + return ERR_PTR(-EIO);
> }
>
> + inode = ext4_iget(child->d_inode->i_sb, ino);
> + if (IS_ERR(inode))
> + return ERR_CAST(inode);
> +
> parent = d_alloc_anon(inode);
> if (!parent) {
> iput(inode);
> diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
> index aa11d7d..345f901 100644
> --- a/fs/ext4/resize.c
> +++ b/fs/ext4/resize.c
> @@ -757,12 +757,11 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
> "No reserved GDT blocks, can't resize");
> return -EPERM;
> }
> - inode = iget(sb, EXT4_RESIZE_INO);
> - if (!inode || is_bad_inode(inode)) {
> + inode = ext4_iget(sb, EXT4_RESIZE_INO);
> + if (IS_ERR(inode)) {
> ext4_warning(sb, __FUNCTION__,
> "Error opening resize inode");
> - iput(inode);
> - return -ENOENT;
> + return PTR_ERR(inode);
> }
> }
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 3c1397f..05434a1 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -634,11 +634,10 @@ static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
> * Currently we don't know the generation for parent directory, so
> * a generation of 0 means "accept any"
> */
> - inode = iget(sb, ino);
> - if (inode == NULL)
> - return ERR_PTR(-ENOMEM);
> - if (is_bad_inode(inode) ||
> - (generation && inode->i_generation != generation)) {
> + inode = ext4_iget(sb, ino);
> + if (IS_ERR(inode))
> + return ERR_CAST(inode);
> + if (generation && inode->i_generation != generation) {
> iput(inode);
> return ERR_PTR(-ESTALE);
> }
> @@ -700,7 +699,6 @@ static struct quotactl_ops ext4_qctl_operations = {
> static const struct super_operations ext4_sops = {
> .alloc_inode = ext4_alloc_inode,
> .destroy_inode = ext4_destroy_inode,
> - .read_inode = ext4_read_inode,
> .write_inode = ext4_write_inode,
> .dirty_inode = ext4_dirty_inode,
> .delete_inode = ext4_delete_inode,
> @@ -1472,6 +1470,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
> unsigned long journal_devnum = 0;
> unsigned long def_mount_opts;
> struct inode *root;
> + int ret = -EINVAL;
> int blocksize;
> int hblock;
> int db_count;
> @@ -1862,19 +1861,24 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
> * so we can safely mount the rest of the filesystem now.
> */
>
> - root = iget(sb, EXT4_ROOT_INO);
> - sb->s_root = d_alloc_root(root);
> - if (!sb->s_root) {
> + root = ext4_iget(sb, EXT4_ROOT_INO);
> + if (IS_ERR(root)) {
> printk(KERN_ERR "EXT4-fs: get root inode failed\n");
> - iput(root);
> + ret = PTR_ERR(root);
> goto failed_mount4;
> }
> if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
> - dput(sb->s_root);
> - sb->s_root = NULL;
> + iput(root);
> printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
> goto failed_mount4;
> }
> + sb->s_root = d_alloc_root(root);
> + if (!sb->s_root) {
> + printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
> + iput(root);
> + ret = -ENOMEM;
> + goto failed_mount4;
> + }
>
> ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
>
> @@ -1954,7 +1958,7 @@ out_fail:
> sb->s_fs_info = NULL;
> kfree(sbi);
> lock_kernel();
> - return -EINVAL;
> + return ret;
> }
>
> /*
> @@ -1990,8 +1994,8 @@ static journal_t *ext4_get_journal(struct super_block *sb,
> * things happen if we iget() an unused inode, as the subsequent
> * iput() will try to delete it. */
>
> - journal_inode = iget(sb, journal_inum);
> - if (!journal_inode) {
> + journal_inode = ext4_iget(sb, journal_inum);
> + if (IS_ERR(journal_inode)) {
> printk(KERN_ERR "EXT4-fs: no journal found.\n");
> return NULL;
> }
> @@ -2004,7 +2008,7 @@ static journal_t *ext4_get_journal(struct super_block *sb,
>
> jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
> journal_inode, journal_inode->i_size);
> - if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
> + if (!S_ISREG(journal_inode->i_mode)) {
> printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
> iput(journal_inode);
> return NULL;
> diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
> index cdee7aa..12354d5 100644
> --- a/include/linux/ext4_fs.h
> +++ b/include/linux/ext4_fs.h
> @@ -944,7 +944,7 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
> sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
> int create, int extend_disksize);
>
> -extern void ext4_read_inode (struct inode *);
> +extern struct inode *ext4_iget(struct super_block *, unsigned long);
> extern int ext4_write_inode (struct inode *, int);
> extern int ext4_setattr (struct dentry *, struct iattr *);
> extern void ext4_delete_inode (struct inode *);
>
> -
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--
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
-
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Next message: Oleg Verych: "Re: [PATCH 1/2] i386: mce cleanup part1: functional change"
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